Replace Bing layer with MapTiler

examples/raster.html

@@ -18,12 +18,12 @@ docs: >
     those pixels based on a threshold value (values above the
     threshold are green and those below are transparent).
   </p>
-tags: "raster, pixel"
+tags: "raster, pixel, maptiler"
 resources:
   - https://unpkg.com/d3@4.12.0/build/d3.js
 cloak:
-  - key: As1HiMj1PvLPlqc_gtM7AqZfBL8ZL3VrjaS3zIb22Uvb9WKhuJObROC-qUpa81U5
-    value: Your Bing Maps Key from http://www.bingmapsportal.com/ here
+  - key: get_your_own_D6rA4zTHduk6KOKTXzGB
+    value: Get your own API key at https://www.maptiler.com/cloud/
 ---
 <div class="rel">
   <div id="map" class="map"></div>